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once in a lifetime
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APASmart Define. (1970). exceedingly rare thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/exceedingly_rare/thesaurus/synonyms
ChicagoSmart Define. 1970. "exceedingly rare thesaurus" https://smartdefine.org/exceedingly_rare/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 1970, exceedingly rare thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/exceedingly_rare/thesaurus/synonyms>.
MLASmart Define. "exceedingly rare thesaurus" 1 January 1970. Web. 22 September 2026. <https://smartdefine.org/exceedingly_rare/thesaurus/synonyms>